JP2013238672A5

JP2013238672A5 - Image forming apparatus, density detection pattern detection method, and formation method

Info

Publication number: JP2013238672A5
Application number: JP2012109932A
Authority: JP
Filing date: 2012-05-11
Publication date: 2015-07-02
Anticipated expiration: 2032-05-11

Description

本発明は、濃度検出パターンの配置位置の制約を緩和し、短い検出パターンでキャリブレーションを行う画像形成装置と、濃度検出パターンの検出方法及び形成方法を提供するものである。
The present invention is to alleviate the limitations of the arrangement position of the density detection pattern, the image forming apparatus to be calibrated in a short detection pattern, is to provide a detection method and a method of forming the density detection pattern.

本発明の一側面によると、複数の色のそれぞれについて、濃度を検出するための濃度検出パターンと、前記濃度検出パターンの位置を特定するための基準パターンを、現像剤により像担持体に形成する画像形成手段と、前記像担持体に向けて照射した光の反射光を受光して受光量に対応する信号を出力する受光手段と、前記受光手段が出力する信号をサンプリングするサンプリング手段と、前記サンプリング手段によりサンプリングされたサンプリング値が保存される保存手段と、前記受光量に対応する信号を閾値と比較することで、前記基準パターンを検出する検出手段と、前記複数の色の少なくとも１つの色について、前記保存手段に保存されたサンプリング値のうち、当該色の前記濃度検出パターンからの反射光に対応するサンプリング値を、前記検出手段が検出した当該色の前記基準パターンの検出時刻から決定する決定手段と、を備えていることを特徴とする。
According to one aspect of the present invention formed, for each color of multiple, and the density detection pattern for detecting the concentration, the reference pattern for specifying the position of the density detection pattern, the image bearing member with a developer image and forming means, and light receiving means for outputting a signal corresponding to the amount of light received by receiving reflected light of the light emitted toward the image bearing member, sampling Gus Ru sampling means a signal that the light receiving means outputs to Storing means for storing the sampling values sampled by the sampling means, detecting means for detecting the reference pattern by comparing a signal corresponding to the amount of received light with a threshold, and at least one of the plurality of colors For one color, among the sampling values stored in the storage unit, the sample corresponding to the reflected light from the density detection pattern of the color Value, characterized in that said detecting means comprises a determining means for determining the detection time of the reference pattern of the colors detected.

Claims

For each color of multiple, and the density detection pattern for detecting the concentration, the reference pattern for specifying the position of the density detection pattern, an image forming unit for forming the image bearing member with a developer,
A light receiving means for receiving reflected light of the light irradiated toward the image carrier and outputting a signal corresponding to the amount of light received;
Sampling means Ru sampling Holdings signals the light receiving means outputs,
Storage means for storing a sampling value sampled by the sampling means;
Detecting means for detecting the reference pattern by comparing a signal corresponding to the amount of received light with a threshold;
For at least one of the plurality of colors, out of the sampling values stored in the storage unit, the sampling value corresponding to the reflected light from the density detection pattern of the color is detected by the detection unit. Determining means for determining from the detection time of the reference pattern;
An image forming apparatus comprising:

The image forming apparatus according to claim 1, wherein the detection unit detects the reference pattern by comparing a sampling value stored by the storage unit with the threshold value.

The image forming apparatus according to claim 1, wherein the detection unit detects the reference pattern by comparing a signal output from the light receiving unit with the threshold value.

The at least one color of the plurality of colors includes a color at which the density detection pattern reaches earlier than the reference pattern at a reflection position of light irradiated by the light receiving unit. The image forming apparatus according to claim 1.

5. The image formation according to claim 1, wherein the image forming unit forms one reference pattern and a plurality of density detection patterns on the image carrier for each color. 6. apparatus.

6. The image forming unit according to claim 1, wherein the image forming member forms a misregistration detection pattern for detecting misregistration together with the density detection pattern and the reference pattern on the image carrier with a developer. The image forming apparatus according to claim 1.

The image forming unit forms a plurality of misregistration detection patterns and a plurality of density detection patterns for detecting misregistration on the image carrier with a developer,
The formation position of the plurality of misregistration detection patterns on the image carrier is determined according to the constraint condition of the misregistration detection pattern,
The formation positions on the image carrier of the plurality of density detection patterns are determined according to the constraint conditions of the density detection patterns,
The reference pattern is formed at a position of the image carrier different from the determined formation positions of the plurality of displacement detection patterns and the plurality of density detection patterns.
The image forming apparatus according to claim 1, wherein the image forming apparatus is an image forming apparatus.

The image carrier is an endless belt stretched by a plurality of rollers,
The constraint condition of the misregistration detection pattern is that an interval between the misregistration detection patterns is (m / 2) times a rotation period of a roller driving the endless belt among the plurality of rollers, where m is Is an odd number,
The restriction condition of the density detection pattern is that the interval between the plurality of density detection patterns is (n / 2) times the rotation period of a tension roller that applies tension to the endless belt among the plurality of rollers, where n is Is an odd number,
The image forming apparatus according to claim 7.

9. The image forming apparatus according to claim 6, wherein the density detection pattern, the misregistration detection pattern, and the reference pattern are formed within one turn of the image carrier.

For each of a plurality of colors, an image forming means for forming a density detection pattern for detecting the density and a reference pattern for specifying the position of the density detection pattern on the image carrier with a developer;
Light receiving means for outputting a signal corresponding to the amount of light received by receiving reflected light of light emitted toward the image bearing member,
An image forming apparatus comprising:
For the at least one of the plurality of colors, the image forming unit is configured such that the density detection pattern reaches the reflection position where the light irradiated toward the image carrier is reflected earlier than the reference pattern. In addition, the density detection pattern and the reference pattern of the color are formed.

Detecting means for detecting the reference pattern by comparing a signal corresponding to the amount of received light with a threshold;
After the detection means detects the reference pattern for the color formed so that the density detection pattern reaches the reflection position of the light irradiated by the light receiving means earlier than the reference pattern, Storing means for storing a value of a signal corresponding to the amount of light received by the light receiving means,
The image forming apparatus according to claim 10, further comprising:

The image forming apparatus according to claim 10, wherein the density detection pattern and the reference pattern are formed within one turn of the image carrier.

Forming a density detection pattern for detecting a density for each of the plurality of colors and a reference pattern for specifying the position of the density detection pattern on the image carrier with a developer;
Receiving reflected light of the light irradiated toward the image carrier and outputting a signal corresponding to the amount of received light;
Sampling the output signal;
Storing the sampled sampling value in a storage means;
Detecting the reference pattern by comparing a signal corresponding to the amount of received light with a threshold;
For at least one color of the plurality of colors, out of the sampling values stored in the storage unit, the sampling value corresponding to the reflected light from the density detection pattern of the color is detected in the reference pattern of the detected color. A step of determining from the detection time;
A method for detecting a density detection pattern, comprising:

For each of a plurality of colors, a forming step for forming a density detection pattern for detecting a density and a reference pattern for specifying the position of the density detection pattern on the image carrier with a developer;
An output step of receiving a reflected light of the light irradiated toward the image carrier and outputting a signal corresponding to the amount of received light;
Including
In the forming step, for at least one of a plurality of colors, the density detection pattern reaches the reflection position where the light irradiated toward the image carrier is reflected earlier than the reference pattern. A density detection pattern forming method comprising forming the density detection pattern and the reference pattern of the color.